//============================================== // CodeName : Fog-Visibility simulation v.0.2 // Author : Babak Sheykhan // Created : May 24, 2017 // Modified_1 : Nov 14, 2017 // Input tip : You don't need to input anything //============================================== // Change log v.0.2 // - Histogram representation of simulation added // - Raw data of simulation is sent to a file // - The proccess modularized using function //============================================== // Description : This program generates raw data // and produces histogram charts for the concept // of exponential fog system which is widely used // in computer graphics and game programming to model // fairly realistic fog effect. Also as a tool to // improving performance by hiding the objects of a scene // where are beyond the minimum threshold of visibility. // The output of this program has fed to a plotting program // (Geogebra) and respective plots has generated. You would // check the following link to see the result: // https://ibb.co/bZn7qv //========================================================== #include #include // std::ofstream #include // std::setprecision(), std::setw() #include // std::pow(), std::floor() using std::cout; using std::cin; using std::endl; void fog_plotter(double, double, double, std::ofstream &); int main() { /**** Program's data ****/ double distance = 0.0; double density_1 = 0.13; double density_2 = 0.33; double density_3 = 0.66; double visibility_1 = 0.0f; double visibility_2 = 0.0f; double visibility_3 = 0.0f; // instantiating fout object out of output file stream class std::ofstream fout; // open/create "Fog_raw.txt" file in working directory fout.open("Fog_raw.txt"); fog_plotter(distance, density_1, visibility_1, fout); fog_plotter(distance, density_2, visibility_2, fout); fog_plotter(distance, density_3, visibility_3, fout); // close the file fout.close(); } void fog_plotter(double dist, double dens, double vis, std::ofstream &file) { const double e = 2.7182818284590452; // Euler's number cout << "------------@" << dens << " density----------> visibility\n"; // In order to fit all 3 histograms in SL console // this loop is going to increment by 3 to control // the height of chart. for (int i = 0; i < 101; i += 3) { // in each cycle, distance increases by 0.3 km dist = i * 0.1; vis = 1.0 / pow(e, dist * dens) * 100; // Sending raw data to a file called "Fog_raw.txt" file << std::setprecision(4); file << "vis @ " << dens << " density @ " << dist << " km is " << std::setw(7) << vis << " %\n"; // Generating histogram... // Each row can generate maximum of 34 characters. cout << "|"; std::cout.precision(3); for (int k = static_cast(floor(vis / 3 + 0.5)) ; k >= 0; --k) cout << char(206); cout << std::setw(7) << vis << " %" << endl; } cout << "|\nv\nDistance(Max 10 km)\n\n"; file << "\n---------------------------------\n"; }